Alterations To Estimating Takeoff Software

I am looking for an experienced programmer to make some alterations to my estimating software. The program is similar to Plan Swift [login to view URL] but not as complex. It is used for importing Pdf, Dwg, Jpeg, Tiff drawings which allow the user to measure square metres by shading the area measured, lineal metres, and count objects. This data is then exported into Excel Please only bid if you have experience in this type of work. This is not a one off project I am looking to work with someone in adding future enhancements to the program on a regular basis